Loom stop motion attachment



Dec. 12, 1944.

511". PUGH LOOM STOP MOTION ATTACHMENT Filed May 24, 1943 AShets-Sheet lDec. 12, 1944. v s. T. PUGH' LOOM STOP MOTION ATTACHMENT 4 Sheets- Sheet2 Filed May 24, 1943 s. T. PUGH LOOM STOP MOTION ATTACHMENT Dec. 12,1944.

Filed May 24, 1943 4 Sheets-Sheet 3 LOOM STOP MOTION ATTACHMENT FiledMay 24, 1945 4 Sheets-Sheet 4 Patented Dec. 12, 1944 UNITED STATES ATENTOFFICE LOOM STOP MOTION ATTACHMENT Samuel T. Pugh, Radford, Va.

Application May 24, 1943, Serial No. 488,243

6 Claims.

This invention relates to a stop motion attachment for a Draper loom.

An object of this invention is to provide an attachment for a loom whichis correlated with a bobbin battery and the lay whereby the loom will bestopped in the event the combined cutter and gripper, known as theStafford cutter, which is eifective at the time of the transfer, failsto grip and hold the thread, of the discharged bobbin.

Another object of this invention is to provide an attachment of thiskind which is adapted to be connected to the center fork stop mechanism,and operable on the first movement of the newly filled shuttle to stopthe loom so as to prevent irreparable damage to the fabric. In practicethis device is designed as an extension of the center fork stopmechanism so thatthis mechanism will be effective to stop the loom underconditions wherein this mechanism is normally ineffective or is delayedin its action.

A further object of this invention is to provide an attachment of thiskind which is moved to set position during each transfer operation, andis moved to released position by the gripped thread of the new bobbinwhen the lay moves away from the transfer mechanism so that in theoperation of the lay following the bobbintransfer the device will benormally inactive.

A further object of this invention is to provide an attachment of thiskind which includes a hunter or setting arm which is secured to thelatch finger of the transfer mechanism, the latter being normallyinactive except during the transfer cycle, so that the setting arm willbe normally out of the path of the stop mechanism except during thetransfer cycle when the latch finger is raised to operative position.

A further object of this invention is to provide an attachment of thiskind which is of simple construction and can be connected to the presentparts of a Draper loom without change and at small cost.

It is well known that in a Draper loom embodying a bobbin battery, aStaiford cutter is used to cut the thread of the new bobbin. This cutterincludes a gripping or clamping means for holding the severed end of thethread until the shuttle makes one or more traverses. A part of thiscutter includes a fiber or leather jaw which when worn and not replacedwill fail to firmly grip the cut thread end, and this loose end causesflaws to occur in the fabric. The attachment to be hereinafter describedwill immediately stop the loom upon failure of the Stafford cutter tofunction properly, the loom stopping on the first traverse of the newlyfilled shuttle and acting ahead of the center fork stop mechanism whichin certain instances is not effective such as when the loose end of thefiller overlies the center fork fingers.

Embodying the foregoing objects and others which may hereinafter appear,the invention consists of the novel construction, combination andarrangement of parts as will be more specifically referred to andillustrated in the accompanying drawings, wherein is shown an embodimentof the invention, but it is to be understood that changes, variationsand modifications may be resorted to which fall within the scope of theinvention as claimed.

In the drawings:

Figure l is a detail front elevation partly broken away of a lay havingmounted thereon an attachment constructed according to an embodiment ofthis invention,

Figure 2 is a plan view of the lay including the box and a portion ofthe transfer mechanism,

Figure 3 is a sectional view taken on the line 33 of Figure 2,

Figure 4 is. a sectional view taken on the line 44 of Figure 2,

Figure 5 is a sectional view taken on the lin 5-5 of Figure 2,

Figure 6 is a plan view partly broken away and in section of the device,

Figure 7 is a sectional view taken on the line 'l'! of Figure 5,

Figure 8 is a plan view partly in section showing the finger and triggersupport, and

Figure 9 is a plan view partly in section of the trigger operator whichis mounted on the latch finger of the transfer mechanism.

Referring to the drawings, the numeral Ill designates generally anoscillatory lay of conventional construction which is associated with aDraper loom. The lay ID has mounted at one end thereofa box ll withinwhich a shuttle I2 is adapted to engage at each reciprocation of thelatter and when the bobbin in the shuttle l2 becomes exhausted a newbobbin is transferred to the shuttle I 2 by means of a bobbinreplenishing structure, generally designated as 14.

The replenishing structure 14 is conventional and the structure hereinshown is similar to the replenishing structure embodied in patent 726,-576, dated April 26, 1903. The replenishing structure includes amagazine I3, a transfer finger l5 which is carried by a bell crank IS.The bell crank l6 includes a pivoted latch finger l1 formed at itsrearward end with a recess l8 within which the bunter l9 carried by thelay I is adapted to engage. The bunter IQ is adapted to rock the bellcrank IE to depress the transfer finger l and eject a bobbin B from themagazine I3, the bobbin B dropping into the shuttle l2 when the latteris in a position overlying an elongated opening which is formed in thebox The loom structure also includes a. combined cutter and gripper 2|for cutting the thread from the empty bobbin at the time of the transferof the new bobbin from the magazine to the shuttle. However, thecombined cutter and gripper 2|, which is known in the trade as aStafford cutter, becomes worn and fails to properly grip the thread sothat the loose end of the thread is dragged into the shed and causesflaws in the cloth. Where the projecting portion of the thread is loose,the center fork mechanism is operated to stop the loom, but if thetrailing end of the thread is long enough to overlie the center forkstop mechanism and is held taut by snagging, the center fork stop.mechanism frequently will not be effective.

The stop motion attachment to be hereinafter described is operativeduring the transfer cycle and is adapted to be effective before thecenterfork stop mechanism. The attachment includes a frame 22 which ismounted on the front side of the box II. The frame structure 22 includesa pair of side frame members 23 and 24 which are held in spaced apartrelation by means of bolts 25 having spacer sleeves 25 mounted thereonThe frame 22 is held in forwardly projecting re lation with respect tothe box ll'by means of an L-shaped supporting member 21. The L.-shapedsupporting member 21 includes an elongated side 28 formed with anelongated slot 29 through which securing bolts 38 are adapted to engage.The provision of the elongated slot 29 provides for the. adjustment ofthe frame 22 with respect to the front side of the box The supportingmember 2'! also includes a rear side 3| having an elongated slot 32through which a fastening bolt 33 is adapted to'engage. The bolt 33 :isthreaded into a depending flange 34 forming part of the box The frame 22has rockably mounted therein a thread engaging finger 35. The finger 35is of U-shape configuration having the bight 38 thereof uppermost, andthe ends of the parallel legs are secured in a block 31 which isdisposed between the sides Hand 24 of the frame 22. The block 31 hasformed integral therewith a shaft 38 which is rockably mounted in theside members 23 and 24. The block 31 is formed with a relatively largecentral opening 38 throughwhich a spring 48- extends. is looped over atransverse bar 4| which is secured between the legs of the finger 35,-and the other end. of the spring 40 is looped over a transverselyextending cotter pin 42.

The cotter pin is disposed below the shaft 38 in a position whereby thespring 40 will swing the finger 35 rearwardly and upwardly to a setposition when the finger 35 passes the center linebetween the cotter pin42 and the axis of the shaft 38. The spring 40 is also adapted to swingthe-finger 35 downwardly to a released position which is the positionshown in dotted lines in Figure 4, when the finger 35 passes the centerlinebetween the shaft 38 and the cotterpin 42. The shaft 38 at one endthereof-has secured One end of the spring 40- thereto a. trigger 43. Thetrigger 43 is locked in- ".lay opposite from the box adjusted positionon the shaft 38 by means of lock nuts 44. The trigger 43 extendsinwardly in spaced relation to the side 23 of the frame 22 and isadapted when in set position to rest on'a shaft extension 45. The shaftextension 45 is disposed on the forward side of the box II and also thelay ID.

The shaft extension 45 is coupled by means of a coupling member 48 tothe center fork stop motion shaft 41. The shaft 41 is urged to the rightby means of a spring 48. The opposite end of the shaft 4'! is pivotallysecured to one side of abell crank 49. The bell crank 49 is rockablycarried by a support 50 secured to the end of the The bell crank 49 isadapted to be rocked counterclockwise, as viewed in Figure 1,simultaneous with the rearward swinging of the lay H] by means of anoperator 5|. The center fork stop motion structure including the shaft41, the bell crank 49 and operator 5| are conventional and form .-a partof the loom structure at present in use. An illustrative form of centerfork stop motion structure is shown in Patent Number 1,865,930 issuedJuly 5, 1932. The attachment herein disclosed is mounted to the right ofthe center fork structure shown in Patent #1365330, as viewed inFigure 1. The shaft extension 45 slidably engages through the side 24 ofthe frame 22 and has secured thereto an abutment or trigger engagingmember 52. The trigger engaging member 5215 secured in adjusted positionlengthwise ofthe shaft extension 45 by means of adjusting bolts 53.

The trigger. 43 is adapted to be rocked rearwardly to a set position inthe path of the reciprocation of the abutment 52 by means of afinger 54.The finger 54- is formed integral with and extends at right angles to aplate 55 which is formed with an elongated opening 58 and secured to thelatch finger adjusting bolt 51. In Fig.- ure 4 the trigger is shownv infull linesin the set position contacting with the reciprocating shaft 45and is shown in dotted lines in the released position. After the bobbintransfer has been completed, the latch flnger |l is swung downwardly toa position out of the path of the bunter I9 by well known mechanism sothat the trigger operator 54 will not be in the-path of the trigger 43during the normal operation of the lay. When in set position; trigger 43is positioned in the path of trigger engaging member 52 soas to therebyhold shaft 41 against endwise movement under the action of spring 48.The holding of shaft against endwise movement positions finger 58 in thepath of the belt shifter mechanism so as to thereby shift this mechanismto loom stopping position.

In the use and operation of this stop motion mechanism, the deviceissecured in proper position on the front side of the lay between thelatch finger andthe combined thread cutter and gripper 2|. The triggeroperating member 54 is secured to the adjusting bolt 51 of the latchfinger l1, and the shaft extension 45 is secured by the couplingmember46 to the conventional for the balance of its rearward movementtoward set position.

Assuming that the combined cutter and gripper 2|, which is adapted toenter the opening 58 in the box I I, properly cuts and grips the threadT when the picker stick moves the shuttle 12 across the lay, the threadT will assume the angle substantially as shown in Figure 2, this anglegradually increasing as the lay moves away from the transfer structure.The movement of the lay away from the transfer structure will cause thethread T which is gripped by the cutter 2| to swing the finger 35downwardly to the released or inoperative position, shown in dottedlines in Figure 4. In this position the trigger 43 will then assume thedotted line positionin Figure 4 out of the path of movement of theabutment 52. Spring 49 will swing finger 35 and trigger 43 to fullyreleased position after finger 35 is rocked forwardly past the verticalcenter of the shaft 38. The stop motion attachment is in the dotted lineposition of Figure 4 inoperative to stop the loom, and the loom willcontinue in its operation until the existing bobbin is empty, whereuponthe transfer cycle will be repeated. Under normal operating conditionsfinger 59 will be moved out of the path of the belt shifting mechanismby means of spring 48.

Assuming that the combined cutter and gripper 2| during a transfer cyclefails to properly grip the thread following the transfer, the finger 35will remain in the full line position shown in Figure 4, as the threadwill not swing the finger 35 to a released or inoperative position.Under this condition the trigger 43 will remain in conand at this timethe finger 59 carried by the bell crank 49 will contact the usual stopmechanism forming part of the center fork stop motion structure to stopthe operation of the loom.

It will be apparent from the foregoing that the attachment hereinbeforedescribed is operative ahead of the operation of the center fork stopmotion structure and works independently of the feelers or fingersforming part of the center fork mechanism.

A device constructed according to this invention has been placed on aDraper loom and has been very effective in preventing flaws occuring inthe weaving of the fabric. This attachment can be produced at arelatively small cost and secured to the present parts of a Draper 100mwithout alterations of such parts.

It will be appreciated that on the last travers of the shuttle duringnormal loom operation the center fork stop mechanism is inoperative, andwhen a new or filled bobbin is transferred to the shuttle the loom willcontinue normal operation irrespective of the condition of the thread,from the discharged bobbin. In looms now in use and not embodying thisattachment, if the cutter and gripper should fail to grip the thread ofthe discharged bobbin, but should cut the same, the threadv end would beloose and would be dragged into the shed, thus causing a flaw in thecloth. However, with this attachment the loom is stopped on the firsttraverse of the newly filled shuttle so that the flaw can be correctedbefore the loose end is irreparably woven into the cloth. The attachmenttherefore prevents the flaws occurring in the cloth which cannot bedetected or corrected by the center fork stop mechanism and effects avery material saving in cloth in that the cloth is maintained firstquality.

What I claim is:

1. A stop motion attachment for a m of that type having an oscillatorylay, a bobbin battery, a reciprocatory center fork stop mechanismcarried by the lay and a combined thread cutter and gripper, saidattachment including an extension secured to the center fork stopmechanism for reciprocation with the latter, an abutment carried by saidextension, a swingable trigger carried by the lay and adapted when inset position to be disposed in the path of said abutment, a triggersetting member carried by the battery mechanism for swinging saidtrigger to an operative or set position when the battery is operative toeffect a bobbin transfer, arid a releasing finger fixed relative to saidtrigger and disposed in a position to engage the thread held by saidcombined cutter and gripper to thereby swing said trigger out of thepath of said abutment.

2. A stop motion attachment for a loom of that type having anoscillatory'lay, a bobbin battery, a reciprocatory center fork stopmechanism carried by the lay and a combined thread cutter and gripper,said attachment comprising normally inactive means mounted on the layand connected to said center fork mechanism for actuating said centerfork mechanism to stop the loom upon failure of said combined cutter andgripper to hold the thread, and means connected with and operated bysaid battery for moving said first means to operative position when thetransfer mechanism is operating on its transfer cycle.

3. A stop motion attachment for a loom for mounting on the lay andcorrelated with the center fork stop mechanism, the bobbin transfermechanism, and combined filler cutter and gripper, comprising a supportmember, means mounting the member on the lay, a thread engaging fingerrockably carried by said member and adapted when in set position to beswung to an inoperative position by the thread held by said combinedcutter and gripper, during the movement of the lay away from thetransfer mechanism following a bobbin transfer, a trigger coupled to androckable with said finger, means secured to said stop mechanism andengageable with said trigger when said finger is in set position foreffecting operation of said stop mechanism, and means carried by saidtransfer structure engageable with said trigger to move the trigger andfinger to set position during the transfer cycle.

4. A stop motion attachment for a loom for mounting on the lay andcorrelated with the center fork stop mechanism, the latch finger oi thetransfer mechanism and combined filler cutter and gripper; comprising asupport member, means mounting the member on the lay, a thread engagingfinger rockably carried by said member and adapted when in set positionto be engaged by the thread extending from the box and gripped by saidcombined filler cutter and gripper whereby said thread will swing saidsecond finger to an inoperative position, an abutment carried by saidcenter fork stop mechanism, a trigger carried by said second finger andadapted to be positioned in the path of movement of said abutment whensaid second finger is in set position, and means fixed to said latchfinger adapted to engage said trigger during the transfer cycle. to.thereby. swing said. second,- finger to; set position.

5.2 A stop. motion attachment, for. a loom; com.- prising a frame meansmountingrsaid frame. on the lay. adjacent the box, an endwisev movableshaft slidably carried by said frame, means couplingsaid shaftvto-thereciproeal center fork stop motion shaft, a thread engagingfingeri rock,- ably carried by said. frame, aspringrconnected. to saidfinger and said firame for.- maintaining said fingerin eitherca. set or.inoperative position, a trigger fixed to said fingerand disposed, at oneside. of said frame, an abutment .carried. by said couplingrmeans and.engageabletwith said trigger when said finger is in set positionstovthereby hold said center forkishaft againstreciprocation, and

momma anopemtsonadaptedto-bo mounted-onthelatch finger of the transfermechanism engageable with said-trigger during the-transfer cycletothereby swingsaid trigger into the path of said abutment:

6; The combination with the center fork stop mechanism of a loom; a 'layoperated bobbin transfer structure-and a, thread cutter andgripper,;of-means correlated 'with'the center fork stop mechanism;said-transfer-structure and said thread cutter-and'gripper for renderingsaid stop mechanism effective to stop the 100m upon failureofysaidthread cutter and gripper to hold the thread-duringthe transfercycle;

SAMUEL TL PUGHZ

